DDSXTY14 — 7.4.3.5.3 contradictory rules for collections

Arrays of all kinds/extensibilities are covered by rules 8-10. Following those we find the "comments" below:

// Arrays with extensibility APPENDABLE use common APPENDABLE rules:
// (29)-(30)
// Arrays with extensibility MUTABLE are not allowed. Treated as APPENDABLE.

Which is either redundant or contradictory. Same issue with Sequences (rules 11-13) and maps (rules 14-16).

Due to this, the notes before rules 29-30 should be revised to remove "Collection or"

// Extensibility APPENDABLE (Collection or Aggregated types), version ?
// encoding

Collection types don't have extensibility

In section 7.2.3, Table 12 states that collection types have no extensibility. The rules in 7.4.3.5 need to be updated to match this.